‘Mandate local sourcing for home rooftop solar system’

To boost use of rooftop solar systems in residences, the government should mandate domestically-sourced components which could inspire confidence among potential customers, according to Tata Power Solar CEO and executive director Ashish Khanna.

The bigger issues facing solar power projects in India are getting lost in the overt focus on lower tariffs, Mr. Khanna told The Hindu, stressing that it was equally important to assess the quality of projects and whether they were meeting cost and longevity assumptions.

“If NTPC, for example, is developing a project, then there will be more than 200 quality engineers working on it,” Mr. Khanna said in an interview. “If somebody puts his money on rooftop solar, and with most of the components coming from outside India, the guarantee obligations are very difficult to enforce. So the confidence will not be generated on the quality.

“If the rooftop segment was reserved for domestic manufacturing, then the customer has a company within the country to address any issues that arise, there is legislation, so that company cannot just up and vanish,” Mr. Khanna added. “There is a quality that can be mandated for products in India and in the same process, you have a sector that is aligning their growth to the growth of rooftop solar. It is a win-win situation.”

Another reason for the poor adoption of rooftop solar in India — where the installed capacity is so far only 1,247 MW out of a target of 40 GW by 2022 — is that the tariffs in place do not make business sense for residential rooftop solar systems.

“The commercial solar rooftop segment is growing. The level that is coming from the commercial rooftops is lower than the grid cost of power, so there is a business model. In the residential part, that business model is not coming. The size of the roof, the roof rights, the cost are all issues. In India, because the residential tariffs for power are lower than those for commercial establishments, there is no business incentive for installing residential rooftop solar system.”

The third important issue to be addressed is how to encourage rooftop solar while also helping the power distribution companies, he said. “If something (rooftop solar) is taking away the best clients of the discoms, why should they promote those after a certain point,” Mr. Khanna wondered.